Using data from the 2014 and 2015 National Health Survey (restricting the sample to current and former smokers who quit in 2010 or later), researchers found that daily e-cig use was in fact the strongest predictor of quitting smoking. People who only vaped occasionally were actually less likely to quit.

"While questions regarding the efficacy of e-cigs for smoking cessation remain, our findings suggest that frequent e-cig use may play an important role in cessation or relapse prevention for some smokers," says Daniel Giovenco, Ph.D., a lead author on the study and assistant professor of sociomedical sciences.

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At the end of the day (and after accounting for a variety of controlling factors like desire to quit, educational attainment, health insurance, and age), the research found that the probability of someone quitting traditional cigarettes was three times higher if they frequently used e-cigarettes, compared to non-vapers.